Bedroom Curtain Colour Advice?

This is a very neutral pallet, and you could likely use any color or design that you like. Why don't you go to a department store or bedding shop where they sell sets, and pick out something that you like. I would suggest something in shades of blue and brown, because I have seen patterns in that color that I like. Many of these sets have curtains to match. If the set that you like doesn't, pick curtains that match one of the colors in the pattern.

However, just about any color would do. Greens, shades of white and cream if you like a neutral pallet, burgundy, pink. You might find a solid that you like as well. If you pick a particularly striking bedding set, you might want to match the drape color to the wall color - either the same shade or lighter; this will make the room look larger, and put the focus on the bed.